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This content comes from Closed Captioning that was broadcast along with this program.

>>want to start with today's top story. and it's a video that's surfaced from a
terror group
vowing to strike during the
winter olympics
in
sochi
. with
17 days
to go now, is russian security ready? and why are u.s. officials complaining about a lack of cooperation? let's get right to nbc's chief foreign correspondent
richard engel
in moscow this morning. good morning to you.

>>good morning, savannah. russian officials say they have security under control. but this latest threat does seem credible. and russian
security forces
are searching for one woman in particular who's gone missing whom they worried could be involved in an attack on the games.

>> reporter: the
olympic torch
passed today in the city in the around the world relay closing in on
sochi
. but terror groups are eyeing these
olympics
, too. a new threat has emerged from the very same
suicide bombers
. both now dead who attacked over the new year. in their calm, last testimony, the young men documented how they've prepared for the attack
step by step
. and some time later, those men, the video claimed, killed dozens of civilians at a
train station
and on a bus. it was just the first wave. the next attacks will bring, quote, a surprise to the
olympics
. security in
sochi
is already tighter than at most airports.
president vladimir putin
has said security is a national priority and that every resource will be used. but on the sunday talk shows, there's been a chorus of concerns and complaints.

>>they've now moved some 30,000 armed troops down to the region. that tells you that their level of concern is great, but we don't seem to be getting all the information we need to protect our athletes in the games. i think this needs to change. and it should change soon.

>>i would not go. and i don't think i would send my family.

>>but why attack the
olympics
? mostly revenge.
russia
is fighting a low-level war in the caucuses. a territory less than 1,000 miles from
sochi
. the republic of dagastan is especially violent. and that's where the
suicide bombers
say they're from. the
winter olympics
aren't really the target,
russia
is. the games, analysts say, are just an opportunity to grab attention, and to try to harm
vladimir putin
.

>> reporter: security is only one point of u.s./
russia
tension. another, of course, is edward snowden, the nsa leaker who now lives in
russia
with some u.s. officials suggesting he had help from
russia
. other officials say he acted alone.